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Net Loss Per Share
 9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Net loss per share
Net Loss Per Share
The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share data): 
 
Three Months Ended 
 September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
 
 
 
 
 
 
 
 
Net loss
$
(11,105
)
 
$
(13,640
)
 
$
(37,467
)
 
$
(38,595
)
Weighted-average common shares outstanding
82,417

 
76,880

 
81,637

 
68,315

Net loss per share - basic and diluted
$
(0.13
)
 
$
(0.18
)
 
$
(0.46
)
 
$
(0.56
)

The following table presents the number of anti-dilutive shares excluded from the calculation of diluted net loss per share at September 30, 2015 and 2014 (in thousands):
 
September 30,
 
2015
 
2014
 
 
 
 
Options to purchase common stock
25,527

 
26,428

Common stock warrants
2,486

 
3,942

Non-vested restricted stock awards
1,612

 
720

Total shares excluded from net loss per share
29,625

 
31,090